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Modified reduced graphene oxide binder as well as preparation method and application thereof

A binder and graphene technology, applied in the direction of adhesives, inorganic adhesives, structural parts, etc., can solve the problems of high threshold for raw material production, environmental pollution, and large environmental pollution, and achieve good rate performance and cycle stability, The effect of good lithium ion conductivity and good electrochemical performance

Pending Publication Date: 2022-08-05
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] High threshold for raw material production and heavy environmental pollution: At present, PVDF production is mainly divided into two methods: emulsion polymerization and suspension polymerization. Initiators (persulfates, alkyl peroxides, etc.) are extremely polluting and highly toxic to the environment

Method used

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  • Modified reduced graphene oxide binder as well as preparation method and application thereof
  • Modified reduced graphene oxide binder as well as preparation method and application thereof
  • Modified reduced graphene oxide binder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 100 mg of graphene oxide powder was uniformly dispersed in 100 mL of NMP solution, sonicated for 2 h, 1 g of ascorbyl palmitate powder was added to the solution and stirred for 4 h until uniform, then placed in a microwave reactor, reacted at a power of 600 W for 3 min, and then placed to room temperature, The product was collected after filtering the excess liquid with an organic filter, filtered again with water, and freeze-dried to obtain a powder sample.

[0048] Electrode preparation: N-L-rGO and lithium iron phosphate were stirred in NMP solution for 3 hours at a mass ratio of 1:9, coated on aluminum foil, and vacuum dried at 120 °C for 12 hours to obtain the corresponding pole pieces.

[0049] Battery assembly: Cut the electrode into a 12mm diameter disc, and use the lithium sheet as the counter electrode, and assemble a CR2032 button battery in an argon atmosphere glove box. The electrolyte is 1M LiPF 6 (EC:DMC:EMC=1:1:1). like Figure 4 As shown, test rate p...

Embodiment 2

[0051] This example is basically the same as Example 1, except that the mass ratio of N-L-rGO to lithium iron phosphate is 2:8. Test rate performance at 0.2, 0.5, 1, 2, 5C, such as Image 6 .

Embodiment 3

[0053] This example is basically the same as Example 1, except that the mass ratio of N-L-rGO to lithium iron phosphate is 0.5:9.5. Test rate performance at 0.2, 0.5, 1, 2, 5C, such as Figure 7 .

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Abstract

The invention provides a modified reduced graphene oxide binder and a preparation method and application thereof.The preparation method comprises the steps that graphene oxide is evenly dispersed in an N-methyl pyrrolidone (NMP) solution, then ascorbyl palmitate powder is added, or the ascorbyl palmitate powder is pre-dispersed in the NMP solution, the mixture is fully stirred for 2-5 h, and the modified reduced graphene oxide binder is obtained; and reacting for 3-5 minutes under the microwave energy of 500-800W, and carrying out suction filtration on redundant solution to obtain the modified reduced graphene oxide binder. According to the invention, grafting of ester bonds and excellent properties of graphene enable the graphene to have high mechanical stress and friction coefficient, high defect density and a multi-dimensional conductive network to facilitate transmission of lithium ions, N-L-rGO is used as a binder to reduce the requirements of production environment, and the materials are still uniformly mixed in a high-humidity environment; and in addition, excellent rate capability and cycling stability are shown in electrochemical performance.

Description

Background technique [0001] With the rapid development of the lithium-ion battery industry, it has basically become the most important type of portable energy storage device. The most important part of the lithium-ion battery should be the electrode material. In the production of the positive electrode material, the traditional binder polyvinylidene fluoride (PVDF), the conductive agent and the active material are prepared into a slurry in N-methylpyrrolidone (NMP). Coated on the current collector, and traditional binders cause high production costs, environmental pollution and performance loss of lithium-ion batteries due to the following problems [0002] Poor conductivity: PVDF, as a non-conductive substance, is difficult for lithium ions to move freely without the introduction of conductive agents (such as acetylene black, Super-P and other conductive carbon black). The only option is to reduce the active material mass fraction to increase its conductivity, which in disgu...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C09J1/00
CPCH01M4/621H01M10/0525C09J1/00H01M2004/028Y02E60/10
Inventor 曹殿学董澍
Owner HARBIN ENG UNIV
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